OIC Email Service limit
With the May 2022 OIC release, emails are restricted to 10,000 in a 24 hour period.
You can track your email usage from Monitoring->Integrations->Dashboard:
When the limit is exceeded, email delivery occurs successfully one last time. For the next (second) delivery, emails stop being sent. You are prevented from sending additional emails until you drop below the 10,000 limit for your 24 hour window.
You will see an error message in the activity stream when you have reached your limit:
NOTES:
- The email quota is built on a 24 hour rolling window. At any particular point in time, the last 24 hours of outbound emails are counted. For example, assume an instance sends 500 emails per hour. After 20 hours, the instance has sent 10,000 emails and is blocked from sending more. After 25 hours, the instance can send more emails because in the previous 24 hours it sent only 9,500 emails.
- When you exceed your quota in only one hour (same hour), you are blocked from sending emails for the next 24 hours.
For more information: